EP0262105B1 - Method in fluidized bed combustion - Google Patents

Method in fluidized bed combustion Download PDF

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Publication number
EP0262105B1
EP0262105B1 EP87850259A EP87850259A EP0262105B1 EP 0262105 B1 EP0262105 B1 EP 0262105B1 EP 87850259 A EP87850259 A EP 87850259A EP 87850259 A EP87850259 A EP 87850259A EP 0262105 B1 EP0262105 B1 EP 0262105B1
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EP
European Patent Office
Prior art keywords
bed
beds
flue gas
air
fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87850259A
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German (de)
French (fr)
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EP0262105A1 (en
Inventor
Järvstrat Göran
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ABB Stal AB
Original Assignee
Asea Stal AB
ABB Stal AB
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Application filed by Asea Stal AB, ABB Stal AB filed Critical Asea Stal AB
Priority to AT87850259T priority Critical patent/ATE81902T1/en
Publication of EP0262105A1 publication Critical patent/EP0262105A1/en
Application granted granted Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
    • F23C10/12—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated exclusively within the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B01J8/26—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with two or more fluidised beds, e.g. reactor and regeneration installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/005—Fluidised bed combustion apparatus comprising two or more beds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M9/00—Baffles or deflectors for air or combustion products; Flame shields
    • F23M9/06—Baffles or deflectors for air or combustion products; Flame shields in fire-boxes

Definitions

  • the invention relates to a method in combusting solid fuel in a first fluidised bed and a second fluidised bed located laterally of the first bed, said beds being mutually separated but communicating with each other a common freeboard being provided above the beds, wherein overflow of fuel particles from the first bed to the second bed is provided and heat power is recovered by heat exchange solely from the second bed.
  • EP-A-0 092 622 describes a method in combusting solid fluid in a first fluidised bed and a second fluidized bed located laterally of the first fluidized bed.
  • One bed has a heat exchanger, and communication is possible between the beds at the top thereof as an overflow to the bed with heat exchanger from the other bed having no heat exchanger therein.
  • the purpose of the invention is to make possible that fuels having a low heat value, such as humid biofuel, is combusted in a stage combustion boiler of a known construction, wherein fuel is supplied to the beds from the top thereof, ash recirculation is provided, and subpressure firing in freeboard is applied, without the necessity of reconstructing the boiler.
  • fuels having a low heat value such as humid biofuel
  • FIG. 1 is a diagrammatic vertical cross-sectional view of an embodiment of a stage combustion boiler for working the method of the invention.
  • a first bed 11 and laterally thereof a second bed 12 said beds having a common freeboard.
  • the beds thus positioned in parallel to each other, comprise a particulate material, substantially ash, sand and/or sulphur sorbent such as lime or dolomite.
  • the beds are supported by bed bottoms 13 and 14, respectively, having a great number of nozzles of known construction uniformly distributed over the total area of the bed bottom, for the supply of a gaseous fluid either solely air or air mixed with flue gas, from manifolds 15 and 16, respectively, below the bed bottom for fluidizing the two beds.
  • the second bed 12 can be deeper than the first bed 11 as in the present case, and it contains one or more tube sets or heat coils 17 for generating steam or hot water. Communication is provided between the beds at the top thereof as an overflow 18 from the first bed 11 to the second bed 12, a connection 19 with suitable conveyor means such as a pneumatic injector 19a being provided at the bottom for controlled transfer of bed material from the second bed 12 to the first bed 11.
  • An inlet 20 having a gate 21 is provided for the supply of fuel, sulphur adsorbent and elutriated ash to the first bed 11 from the top thereof.
  • the sulphur adsorbent then can be added to the fuel in line externally of the boiler. Instead of being supplied from the top of the bed the fuel can be injected into the bed proper e.g. from below through one or more supply conduits opening in the bed.
  • a number of cooled or uncooled insulated flow deflectors 22 are provided to direct flue gas from the first fluidized bed 11 towards the flue gas from the second fluidized bed 12.
  • a passage 23 having means 24 for the supply of combustion air in addition to air supplied through the fluidized beds is provided for the discharge of the flue gases from the freeboard and directing the flue gases horizontally.
  • the passage 23 connects over a dust separator 25 to a flue gas outlet 26 which can be connected to a laterally positioned external flue gas boiler.
  • a pocket 27 is provided for collecting dust from the dust separator 25 and is provided with a conveyor 28 for recirculation of separated dust to the first fluidized bed 11 through the inlet 20, b ut there should also be provided means for discharging excess dust in connection with the recirculation of dust although such means are not shown here.
  • the dust in the pocket can flow by gravity through a conduit directly into the bed 11.
  • the start can be effected by using one or more freeboard burners operating with gas, oil, or powder, which are directed towards the first bed 11 which is an "uncooled" bed, since no heat exchange tubes are arranged therein.
  • the bed is fired with excess air.
  • the first bed 11 is fired substoichiometrically by supplying primary air through the bed bottom 13 from the manifold 15 at a velocity of about 3 m/s. Flue gas may be mixed with the air supplied from the manifold 15 in a suitable proportion so as to achieve substoichiometrical combustion.
  • the temperature of the bed 11 (the cooling of the bed) is controlled partly by adjusting the supply of fuel and/or air/flue gas, and partly by varying the amount of material supplied to the bed 11 from the bed 12 through the connection 19.
  • Material is supplied to the second bed 12 partly from the bed 11 via the overflow 18 and partly by dust and splash falling down separated from the flue gas leaving the bed 11, when such flue gas is directed towards the flue gas from the bed 12.
  • Secondary air is supplied to the latter bed through the bed bottom 14 from the manifold 16, and this bed is fired with a large excess of air, the secondary air being supplied at a velocity of about 1.5 m/s. It is advantageous to have such a low air velocity in this bed, because erosion on the tubes 17 is avoided.
  • the flue gas from the bed 12 thus is considerably richer in oxygen than the flue gas from the bed 11.
  • raising or lowering the bed level or by controlling the recirculation flow from the bed 12 to the bed 11 it is possible to increase and decrease, respectively, the supply of material from the bed 11, which is richer in fuel, to the bed 12, which is poorer in fuel, and vice versa.
  • This control has to take place in dependence on the type of fuel used.
  • the take-up of heat via the tubes 17 in the bed 12 can be adjusted partly by controlling the temperature of the bed and partly by controlling the level of the bed in relation to the tubes 17.
  • the desulphuring by the supply of sulphur adsorbent will be less effective in this bed, but on the other hand the advantage is achieved that low contents of nitrogen oxides (NOX) in the flue gas from the bed 11 are obtained, the main combustion of the fuel taking place in said bed. Due to the transfer of dust and splash from the flue gas from the first bed 11 to the second bed 12 which is fired at a large excess of air, an effective desulphuring is obtained in said latter bed.
  • the desulphuring can be further improved by making the first bed 11 deeper and by differentiating the air supply, a minor amount of air being supplied to the lower portion of the bed and a major amount of air being supplied to the upper portion of the bed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Solid-Fuel Combustion (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

Method in combusting solid fuel in a first fluidized bed (11) and a second fluidized bed (12) located laterally of the first bed, said beds being mutually separated but communicating with each other. Fuel particles are transferred from the first bed to the second bed. The first bed is operated substoichiometrically and the second bed is operated with a large excess of air. Flue gas from the first bed is diverted in a common freeboard over the beds to be directed in counterflow towards the flue gas from the second bed. Heat power is recovered solely from the second bed.

Description

  • The invention relates to a method in combusting solid fuel in a first fluidised bed and a second fluidised bed located laterally of the first bed, said beds being mutually separated but communicating with each other a common freeboard being provided above the beds, wherein overflow of fuel particles from the first bed to the second bed is provided and heat power is recovered by heat exchange solely from the second bed.
  • Combustion in two fluidized beds communicating with each other is disclosed in US-A-3,893,426, JP-A-58-85004, and JP-A-58-95104, ash particles in the flue gases from the first fluidised bed in the latter case being transferred to the second fluidised bed to be combusted therein.
  • EP-A-0 092 622 describes a method in combusting solid fluid in a first fluidised bed and a second fluidized bed located laterally of the first fluidized bed. One bed has a heat exchanger, and communication is possible between the beds at the top thereof as an overflow to the bed with heat exchanger from the other bed having no heat exchanger therein.
  • The purpose of the invention is to make possible that fuels having a low heat value, such as humid biofuel, is combusted in a stage combustion boiler of a known construction, wherein fuel is supplied to the beds from the top thereof, ash recirculation is provided, and subpressure firing in freeboard is applied, without the necessity of reconstructing the boiler.
  • For said purpose the method of the invention has obtained the characteristics appearing from claim 1.
  • In order to explain the invention in more detail it will be described below with reference to the accompanying drawing in which the figure is a diagrammatic vertical cross-sectional view of an embodiment of a stage combustion boiler for working the method of the invention.
  • According to the drawing there is provided in a boiler casing 10 a first bed 11 and laterally thereof a second bed 12, said beds having a common freeboard. The beds thus positioned in parallel to each other, comprise a particulate material, substantially ash, sand and/or sulphur sorbent such as lime or dolomite. The beds are supported by bed bottoms 13 and 14, respectively, having a great number of nozzles of known construction uniformly distributed over the total area of the bed bottom, for the supply of a gaseous fluid either solely air or air mixed with flue gas, from manifolds 15 and 16, respectively, below the bed bottom for fluidizing the two beds. The second bed 12 can be deeper than the first bed 11 as in the present case, and it contains one or more tube sets or heat coils 17 for generating steam or hot water. Communication is provided between the beds at the top thereof as an overflow 18 from the first bed 11 to the second bed 12, a connection 19 with suitable conveyor means such as a pneumatic injector 19a being provided at the bottom for controlled transfer of bed material from the second bed 12 to the first bed 11.
  • An inlet 20 having a gate 21 is provided for the supply of fuel, sulphur adsorbent and elutriated ash to the first bed 11 from the top thereof. The sulphur adsorbent then can be added to the fuel in line externally of the boiler. Instead of being supplied from the top of the bed the fuel can be injected into the bed proper e.g. from below through one or more supply conduits opening in the bed. In the freeboard over the two beds a number of cooled or uncooled insulated flow deflectors 22 are provided to direct flue gas from the first fluidized bed 11 towards the flue gas from the second fluidized bed 12. A passage 23 having means 24 for the supply of combustion air in addition to air supplied through the fluidized beds is provided for the discharge of the flue gases from the freeboard and directing the flue gases horizontally. The passage 23 connects over a dust separator 25 to a flue gas outlet 26 which can be connected to a laterally positioned external flue gas boiler. In order to avoid a too high flue gas temperature in the boiler casing at the top thereof there should be provided in this portion of the boiler casing adjusted cooling surfaces in the conventional manner. A pocket 27 is provided for collecting dust from the dust separator 25 and is provided with a conveyor 28 for recirculation of separated dust to the first fluidized bed 11 through the inlet 20, b ut there should also be provided means for discharging excess dust in connection with the recirculation of dust although such means are not shown here. Alternatively, the dust in the pocket can flow by gravity through a conduit directly into the bed 11.
  • When the method of the invention is applied in the boiler described the start can be effected by using one or more freeboard burners operating with gas, oil, or powder, which are directed towards the first bed 11 which is an "uncooled" bed, since no heat exchange tubes are arranged therein. During the starting procedure the bed is fired with excess air. When the start has taken place and the continuous operation takes over, the first bed 11 is fired substoichiometrically by supplying primary air through the bed bottom 13 from the manifold 15 at a velocity of about 3 m/s. Flue gas may be mixed with the air supplied from the manifold 15 in a suitable proportion so as to achieve substoichiometrical combustion. The temperature of the bed 11 (the cooling of the bed) is controlled partly by adjusting the supply of fuel and/or air/flue gas, and partly by varying the amount of material supplied to the bed 11 from the bed 12 through the connection 19. Material is supplied to the second bed 12 partly from the bed 11 via the overflow 18 and partly by dust and splash falling down separated from the flue gas leaving the bed 11, when such flue gas is directed towards the flue gas from the bed 12. Secondary air is supplied to the latter bed through the bed bottom 14 from the manifold 16, and this bed is fired with a large excess of air, the secondary air being supplied at a velocity of about 1.5 m/s. It is advantageous to have such a low air velocity in this bed, because erosion on the tubes 17 is avoided. The flue gas from the bed 12 thus is considerably richer in oxygen than the flue gas from the bed 11. By raising or lowering the bed level or by controlling the recirculation flow from the bed 12 to the bed 11 it is possible to increase and decrease, respectively, the supply of material from the bed 11, which is richer in fuel, to the bed 12, which is poorer in fuel, and vice versa. In other words, it is possible to de-activate said latter bed more or less and at the same time to balance the cooling of the bed 11. This control has to take place in dependence on the type of fuel used. Thus, there is provided in this manner an excellent possibility of adapting the combustion to different types of fuel in one and the same boiler construction. The take-up of heat via the tubes 17 in the bed 12 can be adjusted partly by controlling the temperature of the bed and partly by controlling the level of the bed in relation to the tubes 17.
  • By operating the first bed 11 with substoichiometrical combustion the desulphuring by the supply of sulphur adsorbent will be less effective in this bed, but on the other hand the advantage is achieved that low contents of nitrogen oxides (NOX) in the flue gas from the bed 11 are obtained, the main combustion of the fuel taking place in said bed. Due to the transfer of dust and splash from the flue gas from the first bed 11 to the second bed 12 which is fired at a large excess of air, an effective desulphuring is obtained in said latter bed. However, if necessary the desulphuring can be further improved by making the first bed 11 deeper and by differentiating the air supply, a minor amount of air being supplied to the lower portion of the bed and a major amount of air being supplied to the upper portion of the bed.

Claims (9)

  1. Method in combusting solid fuel in a first fluidized bed (11) and a second fluidized bed (12) located laterally of the first bed, said beds being mutually separated but communicating with each other, a common freeboard being provided above the beds, wherein overflow of fuel particles from the first bed to the second bed is provided and heat power is recovered by heat exchange solely from the second bed,
    characterized in that the first bed is operated substoichiometrically and the second bed with large excess of air, and that the flue gas from the first bed is diverted towards the flue gas from the second bed to mix the flue gases from the two beds in the common freeboard.
  2. Method as in claim 1 wherein particulate material is transferred from the second bed (12) to the first bed (11) at the bottom of the beds.
  3. Method as in claim 2 wherein the cooling of the first bed is varied by controlling the flow of particulate material between the beds.
  4. Method as in claim 1 wherein dust separated from the flue gas from the two beds is recycled to the first bed (11).
  5. Method as in claim 1 wherein the heat recover in the second bed (12) is controlled by adjusting the level of the bed (12) in relation to a heat exchanger (17).
  6. Method as in claim 1 or 5 wherein the heat recover in the second bed is controlled by adjusting the temperature level in the bed.
  7. Method as in claim 1 wherein fuel is supplied to the first bed (11) from the top thereof.
  8. Method as in claim 1 wherein air mixed with flue gas is supplied to the first bed (11).
  9. Method as in claim 1 wherein air is supplied to the first bed (11) at different levels, the air flow at the top being greater than that at the bottom of the bed.
EP87850259A 1986-08-28 1987-08-27 Method in fluidized bed combustion Expired - Lifetime EP0262105B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87850259T ATE81902T1 (en) 1986-08-28 1987-08-27 FLUID BED COMBUSTION PROCESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8603625 1986-08-28
SE8603625A SE457905B (en) 1986-08-28 1986-08-28 SET FOR COMBUSTION IN FLUIDIZED BATH

Publications (2)

Publication Number Publication Date
EP0262105A1 EP0262105A1 (en) 1988-03-30
EP0262105B1 true EP0262105B1 (en) 1992-10-28

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ID=20365421

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Application Number Title Priority Date Filing Date
EP87850259A Expired - Lifetime EP0262105B1 (en) 1986-08-28 1987-08-27 Method in fluidized bed combustion

Country Status (10)

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US (1) US4860693A (en)
EP (1) EP0262105B1 (en)
KR (1) KR950013958B1 (en)
AT (1) ATE81902T1 (en)
DD (1) DD266837A5 (en)
DE (1) DE3782391T2 (en)
ES (1) ES2036597T3 (en)
IN (1) IN170066B (en)
PL (1) PL159868B1 (en)
SE (1) SE457905B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640377A1 (en) * 1986-11-26 1988-06-09 Steinmueller Gmbh L & C METHOD FOR BURNING CARBONATED MATERIALS IN A FLUIDIZED LAYER REACTOR AND DEVICE FOR CARRYING OUT THE METHOD
US5275788A (en) * 1988-11-11 1994-01-04 Peter Stoholm Circulating fluidized bed reactor
US5181481A (en) * 1991-03-25 1993-01-26 Foster Wheeler Energy Corporation Fluidized bed combustion system and method having multiple furnace sections
US5239946A (en) * 1992-06-08 1993-08-31 Foster Wheeler Energy Corporation Fluidized bed reactor system and method having a heat exchanger
US5299532A (en) * 1992-11-13 1994-04-05 Foster Wheeler Energy Corporation Fluidized bed combustion system and method having multiple furnace and recycle sections
US5392736A (en) * 1993-12-27 1995-02-28 Foster Wheeler Energy Corporation Fludized bed combustion system and process for operating same
ES2424815T3 (en) * 1997-12-09 2013-10-08 Pyroneer A/S Method and apparatus for gasification of solid carbonaceous material
SE9800380L (en) * 1998-02-10 1999-08-11 Asea Brown Boveri Combustion chamber and method for controlling combustion in a combustion chamber
ATE554344T1 (en) 2007-12-22 2012-05-15 Michael Kaden FLUIDIZED BED FIRING

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Publication number Priority date Publication date Assignee Title
GB1307220A (en) * 1969-06-12 1973-02-14 Foster Wheeler Brown Boilers Fluidised bed combustion apparatus
GB1379578A (en) * 1971-08-18 1975-01-02 Coal Industry Patents Ltd Fluidised bed apparatus
GB1448196A (en) * 1972-10-20 1976-09-02 Sprocket Properties Ltd Fluidised bed incinerators
US3893426A (en) * 1974-03-25 1975-07-08 Foster Wheeler Corp Heat exchanger utilizing adjoining fluidized beds
US4279207A (en) * 1979-04-20 1981-07-21 Wormser Engineering, Inc. Fluid bed combustion
US4548138A (en) * 1981-12-17 1985-10-22 York-Shipley, Inc. Fast fluidized bed reactor and method of operating the reactor
US4416418A (en) * 1982-03-05 1983-11-22 Goodstine Stephen L Fluidized bed residential heating system
US4457289A (en) * 1982-04-20 1984-07-03 York-Shipley, Inc. Fast fluidized bed reactor and method of operating the reactor
US4475884A (en) * 1982-11-30 1984-10-09 The United States of America as represented by the United States _Department of Energy Reversed flow fluidized-bed combustion apparatus
GB2150854B (en) * 1983-12-06 1987-09-16 Coal Ind Hot gas generation
JPH0229372Y2 (en) * 1984-09-26 1990-08-07
US4594967A (en) * 1985-03-11 1986-06-17 Foster Wheeler Energy Corporation Circulating solids fluidized bed reactor and method of operating same
US4688521A (en) * 1986-05-29 1987-08-25 Donlee Technologies Inc. Two stage circulating fluidized bed reactor and method of operating the reactor
US4665864A (en) * 1986-07-14 1987-05-19 Foster Wheeler Energy Corporation Steam generator and method of operating a steam generator utilizing separate fluid and combined gas flow circuits

Also Published As

Publication number Publication date
SE457905B (en) 1989-02-06
DE3782391T2 (en) 1993-08-05
US4860693A (en) 1989-08-29
DE3782391D1 (en) 1992-12-03
IN170066B (en) 1992-02-01
DD266837A5 (en) 1989-04-12
ES2036597T3 (en) 1993-06-01
PL159868B1 (en) 1993-01-29
PL267476A1 (en) 1988-07-21
SE8603625D0 (en) 1986-08-28
ATE81902T1 (en) 1992-11-15
KR880003150A (en) 1988-05-14
EP0262105A1 (en) 1988-03-30
KR950013958B1 (en) 1995-11-18
SE8603625L (en) 1988-02-29

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